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Topic: When to add a super to new hive with old comb? (Read 432 times)

My first bees did not make it thru the winter so I bought new ones. Before they arrived I still had a small opening and had robbers coming in. I had someone check it all out before I added the new bees to the old hive. I know the rule of thumb if they didn't have comb built but what is it when I already have established comb to add a new super? Thanks.